This looks like a close competitor to CoApp (<a href="http://coapp.org/" rel="nofollow">http://coapp.org/</a>) - both are FOSS package managers for Windows, although it appears Chocolatey places less emphasis on libraries and other developer-focused packages. That is, CoApp is emphasizing shipping both source and binary packages, and provides more help to package maintainers still trying to make their programs build on Windows.<p>Chocolatey will probably get more users early on though, because of its association with the ever-popular NuGet (watch for the Scott Hanselman blog post...).
I had high hopes when I saw the title. I was expecting something for getting MinGW precompiled libraries like openssl, curl or boost; which I find needing more than often.